How popular is Dario?

Dario is a somewhat popular first name for men (#976 out of 1220, Top 80%) and an even more popular surname for all people (#43955 out of 150436, Top 29%). (2000 U.S. Demographics)

Dario entered the list in 1910-1919 and reached its peak rank of #763 in the U.S. in 1991, and is currently at #914. (Top 2000 Names, 2015)

Which version is better?

with similar and related boy names. Prominent related forms of Dario (#914 the previous year) are Darious, Darius(#501 the previous year), Darrius(#1865) and Derry. These forms of Dario were favored in the year 1994 (usage of 0.14%) and are now much less common (usage 0.05%, ▼67%), with forms like Darius becoming less fashionable. Darius is the longstanding favorite, although Dario seems to be gaining popularity too.